Honda Civic 2000 tronido when he turned off

How about friends! I have a problem with a civic because when it turns it out it sounds like a rod as if it were caused by a spring, initially I assumed that it was for the printing speed in the mobile, but it became more and more common ... when it turns it off even after an hour it continues and continues to thunder with spaces like 5 minutes ... I have checked the electric and nothing, to the mechanic and nothing, they told me that I related experience ... greetings !!!